Dyestuff.



zoyl Q-amino-5-naphthol-7-sulfonic acid in a UNITED STATEIQS PATENT OFFICE.

CARL OSKAR MT T LLER, 0F HfiCHST-ON-THE-MAIN, AND AUGUST LUTHER, OF NIED- ON-TlfIE-MAIN, GERMANY, ASSIGNORS TO FARBWERKE VORM. MEISTER LUCIUS & BRUNING, 0F HdCI-IST-ON-THE-MAIN, GERMANY, A CORPORATION OF GERMANY.

DYESTUFF.

No Drawing.

To all whom 'it'may concern:

Be it known that we, CARL OSKAR LER, Ph. D., chemist, and Atrc'osr LUTHER, Ph. 1)., chemist, citizens of the Empires of Germany and Russia, respectively, residing at Hochst-on -the-Main and Nied-on-thc- Main, Germany, respectively, have invented certain new and useful Improvements in New Dyestuffs, of which the following is a specification. I 7

ehave found that new dyestuffs of great technical value can be obtained by combining the amino derivatives of the amino5-naphthol-7-sulfonic acid and then diazotizing the dyestuffs thus obtained and.

coupling them with ffi-naphthol. These new dyestuffs have the following formula:

They readily dissolve in water with a red color and dye unmordanted cotton bright yellowish-red tints of excellent fast-nose to acidsi The following example illustrates'our invention: 19 kilos of p-aminobenzylsulfonic acid are diazotized in the known manner and-combined with 40 kilos of p-aminobensolution rendered alkaline with soda. The dyestufl' thus obtained is salted out, filtered off and washed with a solution of common salt. Itis then made into a fine magma and after being diazotized in the usual manner,

it is combined with 15 kilos of fit-naphthol,

Specification of Letters Patent.

Application filed November 17, 1911. Serial No. 660,893.

Patented Oct. 15, 1912.

filtered, pressed and dried. The dyestu'fi d n being red powders readily soluble in water with a red color, dyeing directly unmordanted cotton bright yellowish-red tints of excellent fastness to acids.

2. As a new article of manufacture, the dyestufl' of the formula: jinsomasoma-l l j-nn-co -1 f 7 l \i/ N N/ being a red powder, readily soluble in water with a red color, dyeing directly unmordanted cotton bright yellowish-red tints of excellent fastuess to acids.

In testimony whereof, we affix our signatures in-presencc of two witnesses.

CARL OSKAR MULLER. AUGUST LUTHER.

\Vitnesses:

JEAN GRUND, CARL GRUND. 

